dunite

[doo-nahyt, duhn-ahyt]
noun
a coarse-grained igneous rock composed almost entirely of olivine.

Origin:
1865–70; named after Mt. Dun in New Zealand, where it is found; see -ite1

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Collins
World English Dictionary
dunite (ˈdʌnaɪt)
 
n
an ultrabasic igneous rock consisting mainly of olivine
 
[C19: named after Dun Mountain, a mountain in New Zealand where it is abundant]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
dunite   (d'nīt', dŭn'īt')  Pronunciation Key 
A coarse-grained igneous rock that consists mainly of olivine.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Dunite with alteration rind of talc and brucite from.
Serpentine is a metamorphic rock derived from dunite and similar rocks.
Amphibolite and chert tectonic blocks also occur in the dunite near the area's southern and western boundaries.
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